Abstract
Aging processes of Cu-4% Ti alloy after the stages of spinodal decomposition and for the stages of the formation of side-bands have been studied by means of small-angle scattering of X-rays. The scattered intensities observed for the both stages of aging can be explained by the existence of particles, i.e. square-wave concentration distribution, and not by the existence of sinusoidal concentration fluctuation due to spinodal decomposition of the alloy. Scattered intensities for the specimens accompanying side-bands are analyzed on the assumption of the formation of zone-complex. The size of the inner zone of the zone-complex increases in proportion to a logarithm of aging time. The formation of zone-complex is almost completed after 1 min aging at 350 and 400°C, and thereafter the coagulation of zone-complex is a main process of the aging. On aging at 450°C, the amount of precipitate increases with the decrease of the solute concentration in the matrix.
